I actually target bench coaches with the highest combined hitting, pitching and fielding ratings. I know there’s conflicting guidance (bench coaches just come in when managers ejected vs. affecting hitting/pitching/etc.), but I’m a believer there is an effect on your hitting and pitching from your bench coach. Plus those bench coaches are usually pretty cheap since people mostly target strategy.
I think that this combined w/targeting good bullpen/1st/3rd coaches can give your team a little edge over the regular season. Granted, I haven’t done any in depth research, so I’m not 100% on this.